Sir Francis Galton, who developed the first systematic measures of intelligence, believed that individual differences in mental ability were the result of differences in individual experience.

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Sir Francis Galton believed that individual differences in mental ability were largely determined by heredity rather than individual experience. He was a proponent of eugenics and believed in improving the human gene pool through selective breeding. It was later researchers, such as Alfred Binet, who developed the first intelligence tests based on the idea that individual experience played a role in determining intellectual abilities.

Sir Francis Galton, Who Developed the First Systematic Measures of Intelligence